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Related Concept Videos

Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

263
Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
263

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Related Experiment Video

Updated: Sep 16, 2025

Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata
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Decoding and engineering temperature-sensitive lethality in Ceratitis capitata for pest control.

Roswitha A Aumann1,2, Georgia Gouvi3,4, Maria-Eleni Gregoriou3

  • 1Department of Insect Biotechnology in Plant Protection, Institute for Insect Biotechnology, Justus-Liebig-University Gießen, Gießen 35394, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|July 7, 2025
PubMed
Summary

Researchers identified a specific mutation in the Lysyl-tRNA synthetase gene responsible for temperature-sensitive lethality in the Mediterranean fruit fly. This breakthrough could enable the development of genetic sexing strains for more efficient sterile insect technique programs.

Keywords:
CRISPR/Cas gene editinggenetic sexing strainlysine--tRNA ligase (Lysyl-tRNA synthetase, LysRS)mini-gene rescuetsl

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Area of Science:

  • Genetics
  • Entomology
  • Molecular Biology

Background:

  • The Sterile Insect Technique (SIT) is an eco-friendly pest control method relying on releasing sterile insects.
  • Genetic sexing strains (GSS) are crucial for efficient SIT by enabling male-only releases, particularly for mosquito control.
  • Developing GSS has been challenging, with a past temperature-sensitive lethal (tsl)-based GSS in *Ceratitis capitata* not being replicated in other pests.

Purpose of the Study:

  • To pinpoint the genetic basis of the temperature-sensitive lethal (tsl) phenotype in *Ceratitis capitata*.
  • To validate the identified mutation's role in the tsl phenotype.
  • To assess the potential for creating novel GSS in other insect pests.

Main Methods:

  • Detailed genetic analysis of the *Ceratitis capitata* lysine--tRNA ligase (LysRS) gene.
  • Introduction of a specific *LysRS* mutation into a wild-type strain.
  • Phenotypic assessment of engineered strains under varying temperature conditions.
  • Complementation test using a randomly integrated *LysRS* minigene.

Main Results:

  • A specific mutation in the *C. capitata LysRS* gene was identified as the cause of the tsl phenotype.
  • Introducing this mutation into a wild-type strain successfully replicated the embryonic lethality under heat stress.
  • The tsl phenotype was reversed by the random integration of an *LysRS* minigene, confirming the mutation's causative role.

Conclusions:

  • The identified *LysRS* mutation is responsible for the temperature-sensitive lethal phenotype in *Ceratitis capitata*.
  • The high conservation of the *LysRS* gene across insect species suggests potential for developing tsl-based GSS in various pest insects.
  • This research paves the way for expanding SIT applications in agriculture and disease prevention through improved GSS development.